Present distribution area of Leistus punctatissimus (continuous red line) and putative western boundaries of the same around year 1900 (broken red line). The eastern boundaries of the area remain uncertain. The glaciers as present today are represented by white spots with black borders. Green areas: presently known distribution of Duvalius breiti. The green arrow indicates the possible re-immigration pathway of this species towards Rolle Pass. S. M.: San Martino di Castrozza.